Lath-cutting machine



April 27,1926. 1,582'5027' H, A. DUNBAR LATH CUTTING MACHINE 5 Sheets-Sheet 1 Filed August 21, 199,4

if (l April 27 1926. v,582,0`27

H. A. DUNBAR LATH CUTTING MACHINE Filed August 91. 1994 5 Sheets-Sheet 2 April 2'?, ma. 1582;(27

H, A. DUNBAR LATH CUTTING MACHINE Filed August 21, 1924 5 Sheets-Sheet 5 April 27 1926. Lsszz? H. A. *DUNE-SAR LATH CUTTING MACHINE Filed August 2l 1924 5 Sheets-Sheet A,

4.4 l A K t O B7 42 'i' il 52 3 .J l ..mHHHHHHUWUH` 44 v .S27/umm@ H. A. DUNBAR LATH CUTHNG MACHINE April 27 Filed August 2.1, F924 5 Sheets-sheet 5 6 4 3 u a 7 M M M 5 im .Il .'IIII. 6 B ao 8 Il 3 7 L llallllll! 9 a im oo W83@ MW Mh 4 o d 8 O /A 7% m No 2 8 f l f i 0 2 l, m, M n@ o0 5 G m,

Patented Apr. 27, 1926.

UNITED ASTATES PATENT foFFlcE;

LATE-CUTTING MACHINE.

Application ined August 21, 1924. semi No. 733,379.

ToaZZ kwhom 'z't may concern.'

Be it known that I, HENRY AGUsTA Dun-i nan, a subject of the King ot Great Britain, and resident oi1 Woodstock, in the Provn ince oft New Brunswick and Dominion' of Canada, have invented certain new and useful Improvements in Lath-Cutting Machin-es, of which the following is specilication.

This invention relates to improvements in lath machines and the objects of the iiivention are to provide animproved machine of this character and in which saws of much lesser gage than those heretofore in use can be use-d to give more satisfaction and greater eiiiciency.

Further objects are' to provide an im-` proved machine `'of this description in which a greater number of laths will be produced from a given quantity of vwood and in which `by decreasing the amount of sawdust from a given Vnumber of laths the expense 1n connection with the disposal othis by-product will be reduced', y l n A still further object is to provide a lath `niuichine in whichV thestr'ain on thewood during the sawing is reduced thereby reducing the number of laths broken during the operation of sawing. y,

Still Vfurther objects arey to so. improve and simplify the construction of the va 1ious parts as to better adapt them to perform the functions required oi" them. A

lilith the foregoingand other objects in view the inventionconsists essentially inthe combination of thin saws and collars r'unning upon arbors supported in adjustable bearings in such a manner that-each cut is made by two or more saws. v Referring now to the drawings in which like characters of reference indicate' corresponding parts in each figure. j

Figure 1 is a side elevation of the left hand side of the machine. n

Figure 2 is a side elevation ofthe right hand side of the machine.

Figure 3 is a rear elevation of the machine.

Figurell is a top guard removed.

Figure 5 ure 4. y y

In the drawingsAv designates the maplan view with saw is a section on lined-4 of Fig@ chine as a whole consisting of a suitable iframe lOradapted to support the mechanism including the drivingmechanism,v the adjustable saw-carrying arbors and the mechanism for moving thelumber to be cut. The frame 10 may be oi' any well known construction and is here shown as comprising a pair of skeleton metalv standards 11 and 1Q suitably connected by cross-bars 18 and slotted at the top to carry the bearing boxes for the saw-driving mechanism.

Referring now more particularly to the driving mechanism, this consists or a driving` shaft 1dprovided with a driving pulley 15 and idler 16, the driving pulley 15 being designed to be belt or other rise connected to the sourcel ot' power. This drivingsha'ft 14. iscarried in suitable split bear- 17 supported'in the frame and extending transversely thereof and therebeyon'd. liithin the frame, keyed to the shaft 14 is the main driving pulley 18 connected by a belt 19 to a pulley 2O adapted to act as a belt tightener Vandmounted in a4 bracket bearing 21 in turn adjustably mounted 'onk the transversely extending cross-bar 22 formed with an offset provided, with guideways with which the b acket ybearing 21 is adapted to slidably engage and whereby the pulley 2() carried thereby may be raised or lowered or in other words adjusted to tighten or slacken the belt 19.

This belt tightener is automatically operated by meansoi an arm 23 pivotally connected at its lower end to a weight- Z-l and y keyed to av spindle 25 at its upper end, the.

spindle 25 extending through bearings 26,011

the cross bar and having, keyed between said bearings, a gear 2T adapted tev mesh with the ruck 2S carried by the slidablv 1. Q5 is also spring actuated by means'of a coil springQi) 'between the end oil' the arni 23 and the bearing 26, and whereby the bracket 21 is designed to retain the pulley 20 in belt tightening position. l

Vile now come to the saw-driving mechanism, the belt 19 engaging neXtwith the sawdriving pulley 30 iixedly mounted on an arbor Si in turn carried by bearing boxes SQand adjustably mounted on the frame. The arbor 31 designed to extend outside of the frame and is provided with a ixed rable bracketk member 21. The spindle*v i collar 3st and an adjustable collar 35 between which are designed to be mounted the saws 36. These saws may be termed the lower saws. Parallel with and above the arbor 31 is the second arboi 37 provided with the upper saw-driving pulley 37 a similar to the lower saw-driving pulley 30. rlhis arbor is similarly mounted in bearing boxes 3S and 39 to the arbor 31 but is slightly out of alignment therewith and it is also provided with a fixed collar e() and an adjustable collar 41 adapted to carry therebetween the upper saws 42. The arrangement of the arbors 31 and 37, out of alignment with one another and carrying the lower and upper saws respectively is to prevent the saws in operation being directly opposite one another when simultaneously cutting the lumber.

From the foregoing it will be seen that on the main driving shaft 1l being operated the pulley 18 will be rotated to operate through the belt 19, the belt tiglitener pulley 20, the lower saw-driving pulley 30 and the upper saw-driving pulley 37, in turn operating the lower saw-carrying shaft or arbor 31 and t-he upper saw carrying shaft or arbor 37. rlhe outer ends of the arbors 31 and 37 are screw-threaded to engage with securing nuts e3 whereby the adjustably mounted saw retaining collars 41 and 35 ai'e secured to hold the saws in position and whereby on the nuts being removed and the collars l1 and 35 slipped off the saws can be quickly and easily replaced or changed. Gn the outside and ext-ending the full length of the machine and slightly therebeyond is a saw table lll. This table consists of a stationary mounted portion 44rsupported on brackets l5 secured to the side of the inachine and a detachably mounted portion 4d on supporting brackets 16, tixedly secured to the stationary portion ist. The stationary portion of the table is suitably recessed to permit the lower saws to extend partially therethrough.

It will thus be seen that to quickly reach the saws it is only necessary to lift the detachably mounted portion t, of the saw table, off the supports 4.6.

Dealing now with the mechanism for feeding lumber to the saw table, this consists es entially of two pairs of cross shafts, arranged at each eiid of the frame, the inembers of which 47, l-S, and 4S) and 50, are carried iii suitable bearings in the frame and arranged one above the other so that their protruding ends will come above and elow the table del. On the table end of these shafts are mounted upper and lower toothed feed rollers arranged in pairs 51 and 52, the lowermost of said rollers being on a level or protruding slightly above the surface of the table 4l and the uppermost rollers registering therewith but slightly spaced therefrom. The bearing boxes 47 and 48a, for the shafts 47 and 43 carrying the uppermost of these rollers, are adjustably mounted to move upwardly and downwardly in openings lined in the frame and are raised or lowered by means adjustably mounted on a lever arm 53 connected to a vertical link and a horizontal link 5G Vpivotally connected at each end to vertical wheels 60, and 61, 62 and 63, respectively, A

the gear wheel GO being designed to mesh with the gear, wheel (31 and the gear wheel 62 with the gear wheel (33. 0n the lower feed roller shafts 19 and 50 are also keyed sprocket wheels G-land 65 connected by a chain 6G to a sprocket wheel (37 on stub shaft G8 mounted in a bracket bearing GS) iixedly secured to the frame. This stub shaftalso lcarries a larger sprocket wheel connected by a chain 71 with a small sprocket wheel 72 on a short or stub shaft. similarly mounted in the frame to the shaft 68, and having keyed thereon a pulley 7l gonnected by a belt. 75 with a small pulley l() on the main driving shalt 14E whereby, on the main driving shaft 14; being operated, the pulley 74: through the belt 7 5 is rotated to operate the shaft 73 with the small sprocket 72 thereon to in turn rotate. through the chain 71 and large sprocket 7 O, the shaft 68 which operates the smaller sprocket wheel 67 which in 'turn through chain GG operates, through the sprockets be and 65 and gears GO, G1, G2 and 63, the feed roller carrying shafts 47, e8, Li9 and The arrangementof a small pulley, then a .large pulley, a small sprocket wheel and then a large sprocket, in the aforementioned driving mechanism Afor the feed rollers` provides for running the latter at a lesser speed than that at which the saws are operated.

It should be noted that the bracket G9, similarly constructed to the bracket G9, iu-r stead of being lixedly secured to the frame is adjustably secured by means of a slot 77 therein, whereby itcan be raised or lowered on the retaining screw 78, the raising or lowering being designed to tighten or loosen the chain 71. This bracket G9n is also provided with a suitable handle 79.

From the foregoing it will be seen that as the sawdriving mechanism is operated, as already described, simultaneously therewith a lumber moving mechanism is also operino ated, both running smoothly and eiiiciently and providing in the combination a selfcontained lath cutting machine.

It should also be noted, in regard to the ieed rollers, that while the uppermost ci' those rollers turn from right to left the lowermost turn from left to right. j

To catch the sawdust I provide a casing SO adapted to fit overthe saws and formed with an extension 8l to be connected to a discharge conduit inany well known manner, the bodyportionof the casing being hinged in one side at 82 to provide ready access to the saws by simply swinging the side backwards.

W'ith reference to the saw-carrying arbcrs 3l and 37 and to their adjustment, this is performed in the case of the lower arbor 3l by means of an adjustably mounted, U- shaped member 83 with which the bearing boxes 32 and 33 for the arbor 3l are formed integral, while in the case of the upper arbor 37 an inverted, adjustably mounted, U- shaped member Si is used and with which the bearing boxes 3S and 39 for the arbor 37 are formed integral. Both these members 83 and 84: are designed to slidably engage with flanges S5, extending` inwardly from the frame, by means of bolts 86 and 87 extending through elongated slots 33 and 39 in the members v83 and 84 and into said flanges so that, when it is desired to adjust the arbor 8l, the bolts 86 are-loosened permitting the arbor to be raised or lowered to a required position when the bolts 86 and S7 are then tightened tore'tain the arbor in adjusted position. Both arborsmay be adjusted in this way, the arbor 37 being raised or loweredon the bolts 87 being loosened.

.aurthermore the upper arbor 3( may be also adjusted by means oi hand operated adjusting screws 88 provided with look nuts S9. rlihese screws extend through a cross bar 90 to engage with lugs 91 formed integral with the inverted, U-shaped member BIL-carrying the arbor 87, the adjustment being made by first loosening the boltsy 87, then operating the adjusting screws 88`to raise or lower the arbor and then tightening the bolts 87 to retain kthe arbor inadjusted position.

As many changes could be made in the above yconstiaiction and lmany appanently widely different embodiments of my invention within the scope of the claims, constructed, without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specifcationand drawings shall be interpreted in an illustrative and not in a ylimiting sense.

What I 'claim as my invention is:

l. In a machine of the character described and in combination, a suitable frame, a saw table, saws arranged above and below said table, arbors for the saws, a detachable U- shf-iped head and a detachable,inverted U- shaped head havingy integral therewith bearing boxes for said arbors, means for slidably mounting the head members on the frame including a iianged portion on the frame having orifices therein adapted to slidably engage witlrthe head members and elongated bolt receiving means through the head members adapted to register with the 'oriiices in said flanges whereby the headinembers are raised or lowered and retained in adjusted position when raised or lowered.

2. In a machine of the character described and in combination, a fram-e, upper and lower saw-carrying arbors on said frame, means for adjustably supporting the arbors comprising flanges formed on the frame provided with oriiices therein, an inverted, U- shaped head member adapted to slidably engage with said flanges and having elongated slotsl therein designed to register with the liange oiiiices, bearing boxes lformed integral with said head member adapted to support the upper saw-carrying arbor, a U- shaped head member having slots therein registering with the iiange` orifices yand adapted to slidably engage with the frame flanges and bearing boxes formed in said head adapted to support the lower arbor and moans through said slots and iiange orifices whereby the arbor-carrying heads are adapted to be raised or lowered and retained in position when raised or lowered, automatically adjustable means for feeding material to the saws and auxiliary adjusting means for the upper member. p

3. The machine as claimed in claim 2 in which the auxiliary adjusting means for the upper saw-carrying arbor comprise a crossbar on the machine and lugs formed oiitlie arbor-carrying head and screw bolts adapted to extend through the cross-bar and to en-l gage with said lugs whereby, on the screw bolts being hand operated, the arbor supporting head is moved upwardly or downwardly to adjust the saws on the saw-carrying arbor. j

ln witness ,whereof lll() 

